We offer a large variety of Rollers and Bearings with expedient Deliveries.|
We have included the following General Information for your use.
Please feel free to Contact Us if we can assist you with your requirements.
A roller is an assembly of three major components: axle, tube and
bearings. The length of a roller is defined in terms of the "between
frame width" or "BF". This BF dimension allows 1/16 in. clearance between
the extension on the bearings and the side frame. Frame thickness is also
important information to insure proper assembly.
Most conveyor rollers have hexagonal axles to avoid rotation of the
axles in the frames and to prevent the inner race from rotating on the
axle. Round axles are also available. Larger sizes are kept from rotating
by use of a keeper bar. Bearings used on these larger axles usually
have set screws or eccentric locking collars to prevent inner races
from rotating on the axle. Hex axles from 1/4 in. through 1 5/8 in.
and round axles from 1/4 in. through 3 7/16 in. diameter are available.
Tubes are specified by outside diameter (O.D.) and wall thickness. Diameters
from 1 in. through 8 in. are available. Wall thicknesses are expressed
as either a gauge or a decimal dimension.
In most cases, each roller will be listed with various bearing
options. The selection may include bearings that are plain, sealed or
shielded. There may also be non-precision, precision or journal bearing
from which you must select. Select the bearing best suited for your needs.
Pin or Ring Retained Axle
This axle has a hole drilled in each end of the axle to
accommodate cotter pins or hog rings. Axles can also be drilled for
pressure lubrication of bearings. Pin retained axles are offered in hex
sizes of 1/4 in. through 1 1/2 in. and in round sizes of 5/16 in. through
3 7/16 in.
Axle Drilled for Lubrication
Spring Retained Axle
This axle has two upsets or "dimples". When assembled into a roller, the axle is held in place
by dimples between bearings. A spring retained roller is assembled into
a frame by first inserting one end of the axle into the frame. The free
end of the axle is then depressed and dropped into the other side frame.
Removing the roller is equally as simple. Spring retained axles are available
in hex sizes of 5/16 in. through 11/16 in. and a round axles size of 1/4
Keeper Bar Retained Axle
This axle has a hole and machined flat on one end. The keeper
bar is welded to the frame and rests against the flat surface of the
axle, preventing it from rotating. The hole is for a cotter pin which
holds the axle in the frame. Keeper bar retained axles are used only on
round shafts 1 in. in diameter and larger.
This type of roller has a tube which is counter bored to the correct inside diameter for the bearing to be press fit into place.
This type of roller has a tube which is crimped down over the bearing to hold it in place. Bearings
installed in this manner are non-replaceable.
This type of roller uses a combination of a bearing and an adapter. The bearing is first press fit into the
adapter and the adpater is then press fit into the tube.
Rollers with Flanges
Flanges can be welded to the tube to guide the product. Flange location and quantity per tube must be specified.
Rollers with Sprockets
Type A plate sprockets are welded to rollers for use in Chain Driven Live Roller conveyors. Single or
multiple sprockets per roller are available. Location of sprockets, chain size and number of teeth must be
specified. Hardened tooth sprockets are also available. Below are the
standard sprockets for specified roller diameters. These sprockets may also be purchased individually.
|2 9/16 in.
|2 1/2 in.
|3 1/2 in.
Rollers with Grooves
Grooves can be rolled into the tube to accommodate 3/16 in. dia. urethane drive belts such as those used on Line Shaft Conveyors.
Location of grooves must be specified. Standard roller diameters include 1 3/8 in., 1.9 in. and 2 1/2 in. Other sizes are available.
|1 3/8 in. O.D. x 18 Ga.
1 3/8 in. O.D. x 16 Ga.
1.9 in. O.D. x 16 Ga.
1.9 in. O.D. x .145 in. Wall
2 1/2 in. O.D. x 11 Ga.
|5/16 in. Hex
5/16 in. Hex
7/16 in. Hex
7/16 in. Hex
11/16 in. Hex
Tapered rollers are available in several sizes.
Rollers with Shot Guards
Tapered rollers are available on select rollers and help protect the bearing against contamination.
Rollers that are Hardened
All heavy-walled rollers are available with a hardened tube surface. Case hardened depth and Rockwell hardness must be specified.
Rollers with Special Coverings
Rollers are available with molded-on urethane or with slide-on sleeves. PVC covers are also available.
Material type, durometer and thickness must be specified.
Rollers with Lagging
Rollers are available with lagging. Types of lagging available for rollers include:
- Resilient rubber with adhesive back - 2 in. wide available in a 60 ft. roll.
- Sand paper with adhesive back - 2 in. wide available in a 60 ft. roll.
- Rough top belting (to be glued and riveted) - 1 in. wide or 2 in. wide available in a 50 ft. roll.
Roller capacity refers to the maximum load a single roller can support. Key factors in establishing a rollers capacity are as follows:
Capacities are based on tube deflection of no more than .21% of BF
and axle angular deflection of no more than 1 degree at the bearings.
Angular deflection of the axle at the bearings is limited to .75 degrees
for cylindrical semi-precision and precision bearings.
- Bearing capacity
- Bearing offest (dimension from side frame to centerline of balls)
- Axle deflection
- Tube deflection
Roller Selection for a Given Load
Because the conveying surface of products is not perfectly flat, use only 2/3 of the rollers under the product when
calculating the required roll capacity.
Common sense tells you that it is not practical to use a 1 3/8 in. diameter roll on 1 1/2 in. centers for a 6000 lb.
product (12 in. wide x 120 in. long), so in addition to the rule above, use the following guidelines:
|Roll Diameter & Axle
||Max. Product Weight
|1 in. O.D. -5/16 in. hex
1 3/8 in. O.D. - 5/16 in. hex
1.9 in. O.D. - 7/16 in. hex
2 1/2 in. O.D. - 11/16 in. hex
3 1/2 in. O.D. - 1 1/16 in. hex
3 1/2in. O.D. - 1 7/16 in. O.D.
4 in. O.D. - 1 7/16 in. O.D.
5 in. O.D. - 1 11/16 in. O.D.
The above guidelines assume "0" shock load and are not applicable for 3 or more lanes.